I just bought another set of Flowmaster's for my truck (Super 10's). The Super 44's that are on it now are fine, I just never really liked how they sound beyond 3000 rpm. They have no dents or scrapes, not welded together, clamped on w/ a spot weld and since the are guarantied for "ever", do people sell these or just throw them on a shelf in the garage? Also they are approx. 4yo.